The GUP Tech ABYss Signal Switcher is a compact ABY switching pedal: it takes one guitar input and routes it to two outputs, so you can run two amplifiers from one pedalboard. GUP Tech describes it as a way to "use two amps without any ground loop and without worrying about phase matching," which are the two problems that usually come up when you plug into a second amp. It is a pedal built by GUP Tech in Saguenay, Québec, Canada1.
Controls and layout
The ABYss keeps things simple: two footswitches and three jacks. The jacks sit on the top edge, with the input on the top right, Output A in the center, and Output B at the left1.
| Control | What it does |
|---|---|
| Left footswitch | Toggles between output A and output B1 |
| Right footswitch | Activates both outputs at once1 |
In practice, the left switch is your amp selector, flipping your signal back and forth between two amps. The right switch brings both outputs on together, so both amps play at the same time1.
Ground lift and phase inverter
Running two amps at once can produce hum from a ground loop, and the two amps can also end up out of phase with each other, thinning the combined tone. The ABYss addresses both: it has a ground lift and a phase inverter, and GUP Tech notes that "GND lift and Phase inverter are active only on output B"1. That means output B is the one you adjust if the second amp hums or sounds weak when both are on.
Power
The ABYss runs on 9Vdc center negative and draws 11mA1. That is a light load, well within what a typical pedalboard power supply output provides.
Availability
GUP Tech's product page listed the ABYss at £77.00 GBP as of 26 October 2026, with the notation "Only 1 unit left" at that time1.
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Questions
What do the two footswitches on the GUP Tech ABYss do?
The left footswitch toggles between output A and output B, so you can switch from one amp to the other. The right footswitch activates both outputs at once, which is how you run both amps together for a fuller combined sound.
Can the ABYss send signal to both outputs at once?
Yes. The right footswitch activates both outputs, so the same guitar signal feeds output A and output B at the same time. The left footswitch, by contrast, toggles between the two outputs.
Does the ABYss have a ground lift?
Yes. The ABYss has a ground lift and a phase inverter, and both are active only on output B. GUP Tech says the pedal lets you use two amps without any ground loop and without worrying about phase matching.
What power does the GUP Tech ABYss need?
The ABYss runs on 9Vdc center negative and draws 11mA. That light draw makes it easy to power from a standard pedalboard supply output.
Where is the GUP Tech ABYss made?
GUP Tech makes all of its pedals in Saguenay, Québec, Canada, and the ABYss is built there as well.
What colors does the ABYss come in?
The ABYss is available in Army Green and Blue, according to GUP Tech's product page.
Sources (1)
- ABYss Signal Switcher, GUP Tech (guptech.ca)